Originally posted by varg
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Corky Bell has a small section on this and mostly says that sectioning it into smaller flanges prevents it from warping in the first place.
He claims that warping is caused by a combination of a temperature gradient across the flange (hottest in the middle) and between the flange and runners (runners expanding more as the flange heatsinks to the head)
Separating the flange to mess with the thermal gradient across the flange, but I don't see how it would change the second half.
And then you're left with a bunch of small flanges which might relax in the L/R Up/Down directions and give you problems that can't be solved with a belt sander...
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